The Flight Simulator X Acceleration Expansion Pack delivers an all new thrilling multiplayer race mode, new action-packed missions, more new content, and newly enhanced DX10 graphics!Challenge friends in the new racing mode, or test your flight skills in the 20 new missions like being a NASA test pilot, performing search and rescue on an ocean liner, or navigating a whiteout blizzard in the backcountry. Also included are six new scenery maps including the famed Red Bull Air Race courses, and three new planes such as the F/A-18A Hornet, EH-101 Helicopter and P-51D Mustang.